DES MOINES, Iowa (AP) – Four more Iowa farms are testing positive for bird flu.

The Iowa Department of Agriculture says an egg-laying farm and a turkey farm in Buena Vista County bring to 15 the number of cases in that county in northwest Iowa. A broiler farm in Osceola County is the state’s first indication of the disease on a farm raising chickens for meat. Officials said Tuesday the farm has 700 birds. Most of Iowa’s affected chickens are egg layers.

Lyon County also has its first case. It’s on an egg farm.

Iowa has 49 cases of bird flu in 13 counties. More than 26 million birds will die.

Minnesota and Wisconsin have no new cases but Nebraska reported its first on a farm with 1.7 million chickens.